Enterasys Networks ROAMABOUT RBT-1602 - Manual (Page 15)

Determining the Antenna Locations
RoamAbout Antenna Site Preparation and Installation Guide 1-3
Determining the Antenna Locations
The following factors determine the locations where you can place the antennas relative to one
another and the distances between them:
• Type of antennas. The RoamAbout antennas are described in Antenna Models on page 1‐9.
• Length of cable connecting the antenna to the AP.
• Data rate required.
• In a LAN‐to‐LAN network, the distance between the buildings.
• Obstructions in the signal path.
• In a wireless infrastructure network, the area around the antenna where clients need to
communicate with the AP.
Typically, the RoamAbout directional and omni‐directional antennas are installed on rooftops.
The directional antenna can also be installed on the side of a building. The following sections
describe the factors that affect the range of the antennas.
Distances with Cables
Table 1‐2 lists the distances for the RBT‐4102, RBT‐4102‐EU, and the RBT‐4102 ‐BG. The distances
include the cables at both ends. For every 6 dBi of cable loss, divide the distance by two. For every
10 dBi of cable loss, divide the distance by three.
. Notes:
• Be sure to calculate the cable loss at both ends, and include the pigtails.
• The distance miles listed are approximate.
• If the RBT-4102-EU uses one 8 dBi (RBTES-BG-M08M) to one or more 14 dBi sector
antenna(s), you will get approximately half the distances shown in Table 1-2 using the 2.4 GHz
band.
Table 1-2 Outdoor Distance Matrix Between Antennas (RBT-4102 LAN to LAN/MultiPoint)
GHz Antenna Cables used
Signaling
Rate
Throughput Miles
5.7 - 5.8 RBT-AH-P23M
(23 dBi to 23 dBi)
For use in North America
only. Pigtail and the
LMR-600-C25F at
each end 54 Mbit/s
36 Mbit/s
24 Mbit/s
6 Mbit/s 21 Mbit/s
17 Mbit/s
13 Mbit/s
4.5 Mbit/s 2
4
6
8
Pigtail and the
LMR-600-C50F at
each end 54 Mbit/s
36 Mbit/s
24 Mbit/s
6 Mbit/s 21 Mbit/s
17 Mbit/s
13 Mbit/s
4.5 Mbit/s 1.2
2.4
3.5
5
Pigtail and the
LMR-400-C50 at
each end 54 Mbit/s
36 Mbit/s
24 Mbit/s
6 Mbit/s 21 Mbit/s
17 Mbit/s
13 Mbit/s
4.5 Mbit/s 0.8
1.6
2.3
3.3